tcprstat is a free, open-source TCP analysis tool that watches network traffic and computes the delay between requests and responses. From this it derives response-time statistics and prints them out. The output is similar to other Unix -stat tools such as vmstat, iostat, and mpstat. The tool can optionally watch traffic to only a specified port, which makes it practical for timing requests and responses to a single daemon process such as mysqld, httpd, memcached, or any of a variety of other server processes.